Fastener for exhaust air valves



FIG. 1 is a perspective view of a fastener for exhaust air valves embodying my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side view taken from the right of FIG. 2;

FIG. 4 is a side view taken from the left of FIG. 2;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof; and

FIG. 7 is a bottom view thereof. 

The ornamental design for a fastener for exhaust air valves, substantially as shown and described. 